.basic{
    height: 100px;
    width: 400px;
    border: 1px solid black;
}

.happy{
    border: 4px solid red;
    background-color: rgba(255,255,0,0.644);
    background:linear-gradient(30deg, yellow, pink, orange, yellow);
}
.sad{
    border: 4px dashed rgb(2,197,2);
    background-color: gray;
}
.normal{
    background-color: skyblue;
}

.atguigu1{
    background-color: yellowgreen;
}
.atguigu2{
    font-size: 30px;
    text-shadow: 2px 2px 10px #f00;
}
.atguigu3{
    border-radius: 10px;
}
